Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed3b11a78516207…

MALICIOUS

PDF

78.7 KB Created: 2021-08-28 01:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f49c63db1e9e1b46d64ba073e9be71d1 SHA-1: 36ebe9662f8ac7e2327506afc0383760a07cb194 SHA-256: 6ed3b11a78516207a422235a734f9f666b788c86d2ea6edc34c1184eb00abc5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the malicious nature indicated by the heuristics and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://living-stone.lu/userfiles/files/7024951320.pdf In PDF document text
    • https://gkia.org/kingkong/userfiles/files/kupetirejikerino.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4f90e125a---midotepimuxewosatibe.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/id4ivkc5fahi5nq428h1pj45s3/68017177186.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e27ee813612bb82cab1e83c53e04964c/xeduzoliravabimukugun.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/felozawogilirati.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/10015281504.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/duduwuzenenidewodabulalo.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940c1d28dfc---33059273138.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/a810n1v965gpaft6gedikgjmnt/62182062977.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/rafanuxurunil.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/sitinadesejedezu.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe7335bee---kejikusinavilot.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/nudofadesumewudi.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f35dd22d1d---99368509213.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/rimiliponadalidabodizosu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608782aaa99e6---zapevamopaji.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/moposojetexegivifiriwuno.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cefc55aebf---petamafinixe.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac66f1d83ab---nesalakokuwewunot.pdfIn PDF document text
    • http://caramelitos.sk/files/verug.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/67618590072.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/vozukamasakuxedozasuv.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/50571046251.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc84c46ff5---fijakuzowuwaxuvuzin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=sunshine+reese+witherspoonPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAF 17240 bytes
SHA-256: 0085ca33a5e9958efaa5127d8f2c0bfb264c6c37c8bf685e1477d18b959ed1c5
font_01_sfnt_off0000fc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11434 10404 bytes
SHA-256: 1a4293cd38963614695fd91d9f8aa04d24bdce51bef446ac3727188c5761f34d

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